Electric measuring instrument.



M. C. RYPINSKI.

BLEGTRIC MEASURING INSTRUMENT.

APPLICATION FILED MAY4, 1908.

Patented Apr. 15, 1913.

Mmm fo.

ATTORNEY l WITNESSES' A UNITEp sTATEs PATENT oEEroE.

f'eitflgnown that: I, Mannion C. ItrriNsni, Y' 'citizenof'the UnitedStates, and a residen-t of New -York, in the county of 'New York i ing is a spe'cication.

Yitsobject to provide a system embodying a a circuit which connects an electric motorl to 'Vide a system embodying a measuring 1n- MAoErcE o.' nYrIivsKI, or NEW WEsTiNGHoUsE ELECTRIC a YORK, Y., ASSIGNOR, 4BY MESNE ASSIGNMENTS, TO MANUFACTURING COMPANY, 0F EAST PITTSBURGH,

PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

Specification of Letters Patent.

ELECTRIC MEASUEING INSTRUMENT'.

, Patented Apr. 15,1913.

Application mea may 4, 190s. serial N. 430,853.

To' all it 'may concern and State of vNew York, have invented a new and useful Improvement 1n Electric Measuring Instruments, of which the follow- My invention relates to systems embodying electric storage apparatus and it. has for single measuring instrument that shall be adapted. tor indicating either the voltage of a storage battery; the charging current which is applied to the battery, or the current which is -supplied from the battery tothe motor during the operation ot the system.

Electric driving motors for automobiles or other vehicles are frequently supplied with energy from `storage batteries carried by such vehicles. Automobiles equipped in this manner are capable of running tor a prede termined length or" time until the energy storedin the batteryis reduced, when it be comes necessary to replenish or charge the battery, this being accomplished, in a well known manner, by applying a-voltage to-the battery somewhat in excess of the normal Voltage 'produced by the battery` itself and in opposition to it.

`According to my present invent-ion, I prostrument to indicate, by means of a single pointer, either the voltage of the line connecting the storage battery and the motor, Y

the current supplied to the battery during the charging period, or the current supplied to the motor from t-he storage battery during the operation of the vehicle; a manuallyoperated switching device for effec-ting suitable circuit connections, anda three-point shunt, to an intermediate point? of which one terminal of the instrument is connected.

` The single ligure .of the accompanying drawing is a diagrammatic view of a system embodying my invention.`

I deem it unnecessary to describe, in detail,the operating mechanism of the meter, since this mechanism fornis no part o t my present invention and since any suitable measuring instrumenthaving a movable coil, as shown' in the drawing, may be employed. The system comprises an electric motor 2, a

-tive terminal of the storage battery 3 through 'shunt 9, conductor 10 and switch 11 to the motor Q; circuit is completed through the mot-or armature 12 and conductor 13 to the negative terminal of the battery. It, under these conditions, it is desired to measure the voltage of the supply circuit, the arm 7*1 of the selective switch 7 is moved to position y which is marked Volts, whereupon a circuit is completed, from an intermediate point 14 of the shunt 9, through a conductor 15, spring support 16 for the movable coil 1, said coil, spring support 17, conductor 18, movable contact arm 7 a of the switch 7, contact member 20,conductor 21, meter resistor 6 and conductor 23 to the supply conductor 13. The coil of the meter is thus connected across the circuit in series relation with meter resistor 6 and, consequently, thev voltage of thepcircuit will be indicated by suitable devices in the usual manner. If it is desired to measure the current which is delivered to the motor bythe battery under these conditions, the arm 7a of the selective switch 7 may be moved to position marked Amperes discharging, in which case, a circuit will be established, from the positive terminal of the battery, through a portion of the shunt 9 to its middle point 14, circuit being continued from this point, as above indicated, through the movable coil'of the meter to the select-ive switch and inallycompleted through contact armi'a (whlch now engages con-tact member24) and conductor 25V to a terminal 26 ot the shunt 9. It will be observedv that the current traverses the coil 1 lof the meter in the same direction as in the former case but is proportional to the current traversing the battery circuit, since the meter is connected in multiple circuit with a portion oi. the shunt, a sultable means being provided for indlcatlng the current- 1n amperes.

. If it is desired to charge the battery, the switch 11 is opened and energy is supplied from. any suitable external source through positive charging terminal 26a and conductor 27, conductor 1() and the shunt 9 to the positive terminal of the battery, circuit being completed, from the negative terminal of the battery, throughconductor 13 and conductor to the negative terminal 29 of the charging plug 4. Since the conductor 10 is still positive, the voltage of the circuit may be read by moving the arm 7a of the selec- -tive switch to position y, as before.

If it is desired to measure the current iiowing into the battery, the arm 7n of the selective switch 7 is moved to position a, which is marked Amperes charging, whereupon a circuit is completed vtrom conduct-or 27 through a portion ofthe shunt 9 to the intermediate terminal 14, and thence through the movable coil of the meter, as before, and is finally completed through movable contact member "Ia of the switch 7,

'contact member 30 and conductor 31 to a terminal 32 of the shunt 9. In this way, the

meter current continues to flow in the same direction through its movable coil but the meter indication will now be a. measure of the current traversing that portion of the shunt 9 which is between the terminal 32 and 14.

Various structural modications, as well as variations in the circuit connections of the system, may be made Without departing from my invention, and I, therefore, desire that only such limitations shall be imposed as are indicated in the appended claims.

I claim as my invention:

1. The combination with a storage battery and an external circuit therefor, of a singlecoil measuring instrument, means for diverting current from said circuit to said instrument and means for varying the connections for one terminal of the instrument to correctly indicate the current traversing the battery circuit during both charging and l discharging operations.

2. The combination with an electric motor, a storage battery for supplying energy thereto, a shunt interposed between the said motor and said battery and having end and intermediate terminals, of a measuring instrument, and a three-point switching device associated therewith :tor indicating the voltage of the battery circuit, the current supplied to the battery, or the current supplied froin the battery.

3. The combination with a receiving cirn Y cuit, a storage battery connected thereto, and

a shuntinserted in the battery circuit. of an electric measuring instrument comprising a movable coil, one terminal of said movable 'coil being connected to an intermediate point 'movable coil, one terminal of which is con- A nected to an intermediate point in the shunt,

a'- resistor one terminal of which is connected to the unshunted side of the circuit, and selective means for connecting the other terminal of the movable coil to the free terminal of the resistor or to the one or the other of the end terminals of the shunt.

" 5. The combination with a storage battery, a receiving circuit connected thereto and a shunt included in thepositive conductor of the circuit, ot' a measuring instrument comprising a movable coil having one terminal connected to an intermediate point in the shunt, a resistor having one terminal connected to the negative terminal of the battery, and a three-point switching device comprising a moving contact member connected to the free terminal of the movable coil, and a plurality of stationary contact terminals respectively connected to the end terminals of the shunt and to the free terminal of the resistor.

6. The combination with an electrical measuring instrument having a single set of electrically energized elements for indicating the amount of current flowing from or into a secondary battery or the battery voltage, of a shunt three-point switch f'or adjusting the circuits in accordance .with the kind of reading desired.

'7. The combination with an electrical measuring instrument having a single set of electrically energized elements for indicating the current supplied by or to a secondary battery or the voltage supplied'by such battery, of a shunt threepoint switch, the movable contact member of which is Vconnected to the instrument winding and the stationary contact terminals of which are severally engaged by said movable contact member to provide the kind of reading desired.

In testimony whereof, I have hereunto subscribed my name this 29th day of April,

MAURICE C. RYPINSKI.

Witnesses:

WM. H. Carini., T. I?. Biioriens. 

